Fix a segmentation fault when using an extension with CID matching and no CID.

Attempting to call an extension which used Caller ID matching with a channel that
has an empty caller id string would result in a segmentation fault.

(closes issue ASTERISK-18392
Reported By: Ales Zelenik
........

Merged revisions 344608 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@344609 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/pbx.c b/main/pbx.c
index d3f456569556bed1fb89eca7c40e39f1298f5ffa..0db13af3707fcd2c1f26b11e40049add611ed93d 100644 (file)
--- a/main/pbx.c
+++ b/main/pbx.c
@@ -2614,7 +2614,7 @@ static int extension_match_core(const char *pattern, const char *data, enum ext_
                prof_id = ast_add_profile("ext_match", 0);
        }
        ast_mark(prof_id, 1);
-       i = _extension_match_core(pattern, data, mode);
+       i = _extension_match_core(ast_strlen_zero(pattern) ? "" : pattern, ast_strlen_zero(data) ? "" : data, mode);
        ast_mark(prof_id, 0);
        return i;
 }